Grinding-machine.



W: EAEZSUEL APPLIUATION FILED 001. 19, 1906;

iatwtea may. 16, 1909. i SHEETSSHEET l.

Witnesses." In 0622 tor:

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B. M. W. HANSON.

GRINDING MACHINE.

APPLIOATION FILED 001*. 19, 1906.

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Patented Mar. 16, 1909.

B. M. W. HANSON.

GRINDING MACHINE.

APPLICATION FILED 001219, 1906.

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GRINDING MACHINE. APPLIOATION'IILED 00T.19, 1906.; 915,174. Patented Mar. 16, 1909.

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B. M. W. HANSON.

GRINDING MACHINE.-

. APPLICATION FILED OUT. 19.1906. 91 5,174.

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. W. HANSON.

GRINDING MACHINE. APPLIUATION FILED 00119, was.

Patented Mar. 16, 1909.

7 SHEETS-SHEBT 7, l "I UNITED STATES arnr ornron.;

BENGT M. WTHANSON, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATIQN OF NEW JERSEY.

GRINDIN G-MA CHINE Specification of Letters Patent. 1 Patented March 16, 1909.

Application filed October 19, 1906. Serial No. 339,643.

To all whom it may concern:

Be it known that I, BENGT M. W. I'IANSON, a citizen of Sweden, having declared my intention of becoming acitizenof the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful, Improvements Grinding-Machines, of which the following is a specification.

This lnvention relates to grinding ma chines and more particularly to that class thereof in which the work to be ground is held on a platen or table which is movable relatively to the reducing or grinding wheel, and which are generally known as (surface grinding machines, and it has for one of its objects the rovision of a machine of this character which is especially adapted to grindthe surface of work generally and also of circular saws in addition to the usual work performed by the machine.

My invention has furthermore for'its ob-.. yect, the provision of a table which 1s mount.

ed for rotation around a normally stationary vertical axis, and which may be slightly tilted so as to permit the grindingwheel to reduce work the central portion ,of which Is somewhat thinner than the peripheral portion thereof. i

A further object'of the invention is the provision of means whereby the table may be continuously rotated and advanced dur-l in'g the grinding o eration to thus bring every art of the si e of the work into contact wlth the grinding-wheel.

The iIlVGIltlOIL has furthermore for 'its object the provision of an automatic feed mechanism for causing the grinding-wheel gradually to advance toward the work for a predetermined amount, thus precisionizing thework performed by the machine. Otherjobjectsof the invention will be iereinaftersetlforth.

the accompanying drawings Figure 1 is front viewof a grinding machine emsodydng my invention; Fig. 2 is a left hand view thereof; Fig. '3 represents a horizontal section on line3e'a3 of Fig. 1, on an enlarged scale; Fig. 4 shows a fractional vertical sec-' an; on line 4&4 of Fig. 1; Fig. 5 is a sectionon.line-.5-5 of Fig. 1; Fi 6 is a central ver- .tical section of the wor '-.s' porting table;

Fig. 7 representsa horizonta section on line of Fig. 6, and Fig. 8 is a plan view of .a belt 20 running over id the machinebed, all superstructures being left off, to show the driving connections.

Like characters designate similar parts throughout the several views.

Referring to the drawings, the numeral 10 denotes the bed of the machine, comprising a lubricant tank 11, from which lubricant,

for instance water, may beconveyed by a pump 12 through a pipe 13 to the reducing the grinding-wheel is adapted to be moved vertically, (see Figs. land 2), through the intervention of a carriage'26 which is guided on ways 27. The belt 20 passes around a pulley 28 having a sliding key-connection with the vertical grinding-wheel arbor 2 9, and disposed between a pair of bearings 30, 31 which project from a bracket 32 attached 'be transmitted from to the upper end of the post 25, and in which i said arbor 29 is journaled, while at the same time the latter may be vertically shifted or moved through said bearings.

The lower end of the arbor 29 is journaled in a bearing 33 constituting a part of the vertically-slidable carriage 26, and it carries the grinding-wheel WV preferably formed in the shape of anannular ring the lower edge-surface of which is adapted to be brought into contact with, and to grind the upper surface of the work.

Inasmuch as it is desirable to carry a plentiful supply of lubricant to the grindingwheel, and also to avoid complexity in piping,-I deem it advantageous to make the ar- -bor.29 tubular, as indicated at 29' in Fig. 2,

and 'to connect the pipe 13 with the interior hollow channel thus formed, in this manner not only throwing a portion of the lubricant directly upon the work-surface, but also -permltting. amajor portion of the lubricant to be thrown by centrifugalforce against the inner wallsurface of the grinding-wheel, from which it will of course drop and thereforecover the lower edge or grinding-surface of the wheel.

As above stated, my improved grindingmachine is'adapted for performing the usual class of work pertaining to what is known as surface grinders, and in the present instance the work may be secured in any suitable manner on a table or platen 34 movable on ways 35, 36 on top of the bed 10.

Means are provided to enable the operator to impart to the table a reciprocatory-moyementby hand, these means consisting of a hand wheel 37, (see Figs. 1 and 3), normally loose on a-tubular shaft 38, but connectedtherewith for hand manipulation by a dog 39, pivoted at 40 on alongitudinally shiftable rod 41, which is recessed or slotted at 42 to receive said dog. The free end of the dog passes through a slot 43 in the tubular shaft 38 and is adapted to engage any one of a series of notches 44 provided 1n the interior surface of the hub 37 of the hand-wheel 37 thus causing both hand-wheel 37 and tubular shaft to rotate simultaneously.

The rear end of the shaft 38 has a pinion head 45 in engagement with a gear 46 indirectly mounted for free rotation on a stud 47 which is rigidly held ina lug 48 projecting inwardly from a plate 49, which is secured to the front of the bed 10 and which has also a bearing 50 for supporting the tubular shaft 38. In its preferred form shown, the gear 46 is rotatably connected by a key 51 with a bevel pinion 52 which is in constant engagement with a bevel gear 53 (see also Fig. 4), the hub 53 of which is vertically disposed and journaled in a bearing 54 attached to, or constituting-a part of, a plate 55, firmly held on lugs 56 of the bed 10. At its up or end the hub or trunnion 53 carries a co lar 57,

' secured thereto by a pin 58, which at the same time passes through a pintle 59 formed on a pinion 60 and entering the tubular bore of the trunnion 53, so that the pinion 60 will be rotated with the bevel-gear 53 as will be readily understood. This pinion 60 is in engagement with arack 61 secured to the under side of the table 34, by screws 62, and hence it will be seen that when the hand-wheel 37 is rotated, the table 34 will be correspondingly moved on its ways, and beneath the grindingwheel VV.-

In addition to the hand-operable mechanism just described, for .reciprocating the table 34, means are provided whereby such movement may be obtained automatically and for a predetermined amount as required by the operator, thismeans being actuated from the main shaft 17 which carries a pulley .63, (see'Figs. 2 and 8), connected by a belt 64 with a pulley 65 on a transversely-disposed shaft 66 j ournaled in suitable bearings 1n the bed 10 and having near its front end aworm 67 (see Fig. 8 in constant engagement with a worm-gear 68, (see Fig. 3). This gear is loosely mounted on a shaft 69, and'rests with one side of its hub against a shoulder 70, while the other end of the hub rests against a collar 71 and is provided with clutch-teeth 72 adapted to be engaged by similar teeth 73 formed on a spool 74 shiftable on the collar 71, so that when the teeth 72, 73 are in engagement, the movement of the worm-gear 68 will be transmitted to the shaft 69.

The spool 74 has a circumferential-gmove 76 to.

receive the shoes 77, (see Fig. 8), pivotall'y supported by a shipper-fork 78, which is pivoted on a stud 79 rigidly held on the underside of the top web-plate of the bed 10,

andwhich has an arm 80 the free end of which is bifurcated at 81 to receive a yoke collar 82 engaging a groove 83 provided therefor near the rear end of the shiftable rod 41, abovementioned, said rod having a hand knob 84 for its manipulation.

When the 'rod 41 is pulled. forward, the do 39 will be caused, (by virtue of an inclined cam-face 85 engaging the end wall of the slot 43), to swing round its pivot 40 and against the action of a spring-actuatedplunger 86, thus withdrawing the clutch end of the dog from the notches 44'of the hand-wheel hub 37, while at the same time the spool 74 is shifted to bring the clutch teeth 72, 73 into engagement, so that in this manner the shaft 69 will be connected with the worm-gear 68 and thus be driven by power, and the handwheel 37 will be left free from the mechanism normally operated-thereby.

Referring to Figs. 3 and 8, it will be seen that the bevel-gear 53 is'in constant engagement with a pair of diametrically oppositely disposed bevel-pinions 87, 88, normally loose upon the shaft 69 and positioned thereon by the bearings 89, for said shaft, and alsoby pinion 87 or 88, so that consequently the table 34 may be moved in opposite directions.

In Fig. 3 the clutch-member- 92 is shown in its central position, neither of thepinions 87, 88 bcing in engagement, the position be' ing only transitory, however, inasmuch as the mechanism for moving said clutch memher is such that either one side or the o thereof will be in clutch. This mechaniimi :1:

is illustrated in Figs. 1 and 40f the drawings,

and comprises a pair of shoes 97 in engagement with the clutch member 92, and carried by the shipper-fork 98 secured upon a rockshaft 90, which is j ournaled in a bearing 100 projecting from the front plate 49, above referred to. At its forward end the shaft 99' has secured thereto an arm or lever 101 which carriesa hardened abutment-member front-plate 49 and may consequently be rocked thereon. The upper end of the barrel 104 has an abutment-stud 10' 7 adapted to be engaged by a pair of dogs 108, 100 screwed to the front edge of the table 34, which is erator to adjust the position of the dogs 108, 109 to any point longitudinally thereof.

It will be seen that when the table is being moved in the direction of the arrow at, (Fig. 1), the dog 108 will ultimately engage the abutment-stud 107, and gradually rock the barrel 104 on its trunnion 105, which action will result in forcing the lowerbeveled end of the spring-plunger 103 past the beveled end of the abut1nent'102, so that the plunger will be caused to riseagainst the tension of the spring 111, which then becomes effective in propelling said plunger downward as soon as the apeXes of the double-beveled abutments have passed each other and thus throw the arm 101 to the right, consequently rocking the shaft 100' to move the clutch member 92 and into engagement with the pinion 88, and

therefore reversing the movement of the bevel gear 53 and, with it, the movement of.

. the table 34, which will then travel. in the direction of arrow 6, Fig. 1. As the dog 109 will then ultimately engage the abutment stud 1.07, the barrel 104 will be reversed in'the manner'above described and the table will consequently be caused again to travel in the direction of arrow a; the change of direction being effected at the end of the table stroke in either direction, the length of which is directly subject to the distance between the dogs 108,109.

In order to render the machine entirely automatic in its functi0n, and to produce precisionized work, means are provided for feeding the grinding wheel toward the work at the completion of each table movement in one direction,'the mechanism employed in connection therewith being operatively connectedwith the reversible barrel 104, above described, and preferably as illustrated in Figs. 1, 5 and 8. 4

Referring first to Fig. 1', itw'ill'be seen that the barrel 104 has a lateral projection 112 for actuating a pinion 113 j ournaled in a stud 114 and carrying a crank arm 115 which is connected by a link 116 with an arm 117 .piv'otally supported on a shaft 118 (see also Fig. 3). This shaft 118 constitutes'the primary'device of the feed mechanism, for the grinding wheel, and is journaled in bearings 119, 120 (see Fig.' 8) of the bed 10. At its 1 rear end said shaft carries a bevel pinion 121 in engagement with a bevel gear 122 1n sliding-key connection with a vertical shaft 123,

which is j'ournaledat its upper end in bearings 124, '125 (see Fig. "2) etween which is disposed a worm 1'26 rigidly secured to the shaft 123 and in engagement with a work gear 127. The latter is normally loose u on a horizontal shaft 128'journaled in the side 26, previously mentioned, and may be co operatively connected therewith by cupg E friction device, as shown inFig. 5, and which provided with a T-slot 110 to enable the opcomprises a clutch member 129 keyed to the movement thereon, toqconnect or. disconnect said shaft with or from the worm'gear 127 as controlled by a hand nut 130,,1n' one d1rec tion, and the hand wheel 131 in the other direction. Atits inner end the shaft 128 is provided with a pinion 132 in engagement with a rack 133 disposed in parallelism with themovement of the slide way, and secured to the front of the post-25. --The primary shaft 118 carries at its front end a" handwheel 134 (seeFig. 3) and-also a ratchet 1.35 the teeth of which are adapted to be engaged by a dog or pawl 136 (see Fig. 1) pivotally held on the arm or pawl-carrier 1.17, which has an oscillatory movement imparted thereto in the manner previously described. From the foregoing explanation it will be understood that the oscillation of the p'awl- I carrier 11? will, acting as the pawl is permitted to engage the teeth of the ratchet 135,

result in advancing the grinding wheel slide 26, and with it the grinding'wheel Vi, toward the work, step by step,'the actual feeding distance being naturally subject to the number of ratchet teeth carried forward by the pawl; and, in order to reduce this number of teeth so asto feed the wheel only one tooth ata time, I prefer to'employ an adjustable stop 137, against which the pawl carrier will come to a rest during its backward movement, a fact which ispermissible by virtue of the link 116 being slotted as indicated at 138. The entire mechanism thus far described constitutes a surface grinding machine, in which the grinding or reducing wheel is disposed on a "vertically-shiftable spindle, a feature .NVlllCll is desirable in grinding flat surfaces inasmuch as the surface is sub jected to the wheel twice, via, at diametrically opposite points thereof, so that consequently the-work can be done in a correspondingly shorter time. i

As above stated the present invention has for one of its objects the provision of a machine which is especially adapted to grind -the side facesof circular saws, in addition to the regular class of work, and hence I deem it expedient to combine with the table of the machine, a special support, adaptedto receive the saw-disks and to present them to the action of the grinding wheel in such a way as tocause the latter gradually to re.- duce the thickness of the disks toward the center, thus establishing in a natural way the clearance requisite for the, proper operation 'of the saw teeth and to prevent all frictional contact or dra on the sides of the'saw. 'In order to accomplish this result without fixture near one end of the table, conse quently leaving the major portion of the latter to be usedeotherwise.

movement of table 34, a flat plate mr The saw support is clearly shown in Figs. 1, 2, 6 and 7,'in which the table 34 carries at one-end thereof a bed plate 140, having at its upper face a substantially annular flange 141 which forms an open chamber 142 for receiv-' ing some ortions of the operating mechanism, an which may be filled with oil for lubricating the latter. An oil channel 143 is in communication with the bottom of the chamber 142 and may serve either to supply lubricant through the filter cup 144 or to withdraw the oil from the chamber, upon the removal of-the plug 145, (see Fig. 6).

The flange 141. has a pair of reinforced portions 146 (see Fig. 7) bored to receive tubular bushings 147, 148, which are driven into place to prevent leaka e of oil from thechamber 142. These bushin s serve as trunnions for supporting one si eof a frame 149 which is adapted to be tilted vertically around the axis of the trunnions, and which may be maintained in its tilted position by an adjusting screw-15O in screw threaded engagement withan ear 151 of said frame,

and resting with its lower end against the upper face of the bed plate 140, while said frame may be held against longitudinal movement on the trunnion bushings, as for l r mesh with a similar pinion 184 attached to j the pulley 65, prev' instance by a check screw 152 entering a groove 153 1n the bushing 147.

From the foregoing itwill be understood 5 that, in as much as the axis of thetrunnions is'disposedat a right angle relatively to the ily be ground so as to have its r nessesj and in order to adapt the present fixture for grmdmg'the saw-d1sks evenly and concentrically all around, I provide in connection with the frame, a saw-supporting 'table 154 which is rotatable around a vertical axis the position of which is subject to the inclination or tilt of the frame 149 which is provided with an annular wearing strip 155 upon which the. table rests. Rotary movement is imparted to, the table 154, through the intervention of a -centrallydisposed trunnion stud 156 having a key connection157 with the hub 158 of a worm gear 158, journaled in a bearing-lug 159 projecting from the lower face of the frame 149, a screw 160 and nut 161 serying to retain the several elements in cooperative relation.

The center line of the worm gear 158 intersects the axis of the trunnion bushings 147,

'148, so as to permit the frame 149, to be tilted Without causin any cramping action between said gear an a worm 162 which is inter osed between said bushin s, and .secu-re upon a shaft 163, journa ed in said bushings and having at its rear end a bevel pinion 164, which is in mesh with a similar pinion 165 the hub 165 of which is journaled in a bushing 166 secured in a casing 167 which is tightly held on the bushing 148, above referred to, and serves as an 011 well for maintaining the gears 164, 165 constantly lubricated,-leakage being prevented by a stufling box 168. The hub 165 is tubular to receive a shaft 169 and has a key connection 170 therewith, and which also has a longitudinal groove 171 (see Fig. 1)

for a key ar'ried by the hub of a pulley'172. journaled in a bearing 172 which is-attached to the machine bed 10. By virtue of the groove 171 the table 34 may be moved along the ways 35, 36 without interfering with x the driving qualifications of the pulley 172, -which obtains its power by a belt 173, from a pulley 174 which is secured upon a shaft 175 journaled in bearings 176, 177 of the bed 10 (see Fig. 8').

Means are provided for operating the shaft 17 5 at different. speeds to correspond with the size of the work and also to regulate the rapidity of presenting a fresh work surface to the action of the grinding wheel, these means consisting preferably 'of a cone pulley 178, secured to the shaft l75anddriven by a belt 179 from a corresponding pulley 180 held upon a spindle181. which is journaled in a bearing 282 attached to the bed, and which berries at its other end a bevel pinion 183 in wusly referred to, and from the main shaft fully explained.

several cooperating 3 is therefore, such which receives its pr or the machine a I The org 11815 the sasv-suppoi r in slightly lowered,the work will be ground to have a thinner peri heral edgethan its cenf 5 port; that is to say while'said axis is transning, and it is entirely immaterial in what particular position the table or platen 34 l may be longitudinally of the bed. The especial purpose of the saw-supporting device being to present all portions of the saw-disk to the action of the grinding wheel, it is self evident that the table 3&1 should be moved so as to permit the grinding wheel to contact with the saw surface for the required amount. This movement may be a reciprocatory. one and controlled by the dogs 108, 109 pro erly positioned on the platen, or if preferre the table 34 may be disconnected from its reciprocating mechanism,-thus leaving it stationary, when the saw table 154 will be rotated without changing its position rela-. tively to the grindin wheel, in which case the latter must needs e fed toward the Work by hand. 1 1 s In connection-with the tilting mechanism of the saw-sup orting table, it may be stated that, if thele side of said table should be tral portion, and a 0 that when the table surface is in parallelism with the ways 35, 36 of the bed, the work will naturally be ground to auniform thickness throughout, provided of course, that the underside of the work is in contact with the table'surface in every instance. I might also state that in the present instance the spindle or shaft for the grinding tool rotates about an'axis transverse or substantially perpendicular to that work-supverse-to saidwork-support it isnot necessary that itbe at ri ht angles thereto. I Having describe .my inventiiom'l claim: 1. The combination, with agrinding wheel, a platen'movable relatively thereto, and a tiltable work-support carried by said platen, and feed mechanism for the grinding by the platen movesupport.

2. The combination, with a grinding wheel, a platen movable relatively thereto, I

4. The combination, with a carriage and. with a rotary-work-support mounted thereon, of a verticallydisposed reducing-tool; means for feeding said reducing-tool toward the work-support; and means for reciprocating the carriage,

5. The combination, with a rotary worksupport, of av reducing-tool, means for mov ing one of said elements toward and from the other; areciprocatory carria e; and means for arresting the movement 0 said carriage at a predetermined point. a

6. The combination, with a rotary worksupport, of a reducing-tool, means for movmg one of said elements toward and from the otherj a reciprocatory carriage; means for arresting themovement of said carriage at a predetermined point, and'reversing mechanism for said carriage. 4

7.- The combination with arotary work sup ing the reducingtool.

ort and a vertically-disposed reducing-f too of meanswhereby. said. work-support may be tilted; and mechanism for fee In testimony whereof I aflix mysignature in presence of two witnesses.

' BENGT M. W. HANSON.

Witnesses F. E. AnnnRsoN, LOUIS F. N. WHITMAN. 

